Feeding and burning fine fuel.



W. D. WOOD FEEDING AND BURNING FINE FUEL. APPLICAT ION FILED APR. 17.1914.

Patgnted May 30 .1916.

WALTER D. WOGD. OF NEW YORK, N'. Y..

FEEDING ,AND BURNING FINE FIi'EL.

Specification'of Letters Patent.

Patented May 1916.

Application filed April 17, 1914. Serial No. 832,524.

To allwhom it may concern: I

Be it known that I, WALTER D. WOOD, a citizen of the United States, residing inthe borough and county of Richmond, city and State of New York, have invented certain new and useful Improvements in Feeding and Burning Fine Fuel, of which the following is a specification, i therein to the accompanying drawing.

reference being had This invention refers to certain new and useful improvements inmechanism for feed- ,ing and burning powdered fuel, such as coal dust, pulverized coal. and similar substances The object of thc invention is to provide improved and simplified means for mixing air with the comminuted fuel and feeding the composition forward under pressure to the furnace where it is to be burned, besides adding to the fuel carrier in its transit a supplemental amount of fresh air which will improve the inflammable quality of the mixture and enable the proper requirements for rapid and successful burning in the furnace'to be met more efficiently.

Theinvention comprises a mixing chamber with means for supplying air thereto, in

combination with fiiiid pressure means for transmitting the mixture to the furnace, and auxiliary means for combining with the first linixture a second quantity of air; and it also comprises various details and peculiarities in the construction, arrangement and combination of the various parts, substantially as will be hereinafter described and then more particularly pointed out the claims.

In the accompanying drawing illustrating my invention, Figure 1 is a topplan which the extra air thereto,

view of, my improved mechanism for' mixing fine fuel and feeding it forward to the furnace, together with means for supplying vice omitted. Fig. 2 is 'a vertical section of the-same, includ ng the screw feeding device, the screw of which is in side view.

Similar characters of reference designate corresponding parts throughout the different figures of the drawing.

The mixing chamber wherein air and coal dust are com ingled in proper proportions, agitated and ilelivered to the transmitting air blast, co sists of a conical hopper 6, to uel is fed from the, bin 1 by means of a feed screw 2, or? a shaft 3, mount ed in a housing 4, having a spout 5 through which the powdered material is fed into the chamber 6. Said chamber delivers into with the screw feeding de-- a pipe-8, through which anairblast is pass ing, and said pipe has a flaring end 9, which;

18 contained within an inclosing cylinder 18 that is adapted to be introduced into the wall of the furnace where the fuel is to be burned. J

- In my present improvements, I furnish the air'which is to mix with the coal and another similar conical pipe 10, that is held within the flaring end 11 of the main fuel pipe 8. 'Thus it will be seen that the/pipes 10 and 12 furnish an injector mechanism which receives the air jet from nozzle 13 and allows atmospheric air to be drawn in between pipes 10 and 12 and between nozzle 13 and pipe 12, so that astrong air blast is created and driven forward through the pipe 8. When it passes the lower end of the conical mixing chamber 6, it absorbs the combined air and'dust falling from said chamber and increases themixture by adding more air to the dust, and the current of air and dust thus formed is swept forward with great rapidity and pressure through the entire length of pipe 8 until it reaches the cylinder 18- and is discharged thereinto through the flaring end 9 of pipe 8, the purpose of this flaring end being to reduce the velocity.

The conical chamber 6 not only receives the fuel fed thereto from the spout 5 on the underside of the housing 4, but it also receives air from the discharge nozzles of the pipes 7 7 which connect with the main supply 15, and are each preferably provided with cocks or valves 16 for turning the supply on and'ofl'. Thus oppositely directed streams of air enter the interior of the-hopper 6. They are opposite from each other so as not to directly impinge upon each other,

i The air combines and allowed to emerge dust, which may be therein, and making an intimate and suitable mixture.

The cylinder 18 already menti ncd', which receives the flaring end of the pipe 8, is perforated laterally with openings 23, to which are fixed conical rings or pipes 19 in which are. supported conical pipes 20, there being annular spaces between the pipes 19 and. 20. The smaller pipes 20 receive air current from the discharge ends 21 of pipes that are connected with the main supply pipe 15, there being acock or valve QQ-to control passage of the air through the discharge ends 21. fl/Vhen the air is turned on from the ends 21, it willblow through the rings or pipes 19 and 20 and cause a strong suction and draw in a quantity of atmospheric air, and by this injector mechanism air will be supplied to thecylinder 18, said air being for the purpose of combustion and being termed combustion air. Its amount willbe regulated by the pressure of the air blast from and 20. Thus while the main nozzle consistingof the concentric pipes 8 and 18'receives a supply of fuel carried thereto under a pressure sufficient to transmit the fuel to the nozzle, it will be evident that said nozzle receives likewise an auxiliary supply of air whose function it is to promote combustion in the furnace, and this combustion air will be added to the carrying air inside the duplex nozzle, or inside the furnace, as the case may be, the union taking place while the stream of fuel-laden air is coursing through the duplex nozzle and entering the wall of the furnace. Thus by the use of a stream of air generated at some distant point or stored in a reservoir and drawn upon for'the purpose, it will be manifest that I am able to organize a which will pass on rapidly to the furnace and to add to such carrying air a plenteous supply of combustion airwhich will be fresh and effective so that the best possible results in the rapid production of a hot and terrific flame will be brought about,

large number of changes in the precise .details of my invention within wide limits 1. In-a device of the class described, the

combination witha mixing chamber, of a passage leading therefrom, means'forcaus ing an air blast to enter one end of said forsupplying air under pressure at the dis the discharge ends 2-1 and also by the construction of the concentric conical rings 19 fuel-laden vehicle and I desire to claim that I may make a passage to provide fuel-carrying air, means charge end of said passage, said means com-.

prising a pair of inlet pipes diametricallyopposed to each other so that the two streams of air therefrom vill commingle and thoroughly break up the stream of fuel laden air, and means forsupplying air for the two purposes from a common source.

2. In a device of the class described, the

- to each other so that the two streams of air issuing therefrom will commingle and thoroughly break up'the stream of fuel laden air.

3. In a device of the class described,-the combination with a chamber for comfuel, of a passage rece'iv mingling air and fuel, of a passage receiving the commingled air therefrom, an injector for introducing air into one end of the passage, another injector for supplying air to the fuel-laden air as it emerges from said passage, said injectorconsisting of two pipes diametrically opposed to each other v so that the two streams of air issuing therefrom will commingle with each other and thoroughly break up the stream of fuel. laden air emerging from said passage, and means for supplying air under pressure to both injectors from a common source.

4. In a mechanism for feeding and burning fine fuel, the combination with an agitating chamber wherein the powdered fuel is stirred and mixed with air, of a passage conveying air and fuel from said chamber, an injector for introducing air into one end of said passage, a second injector for supplying combustion diametrically opposed to each other so that the two streams of air issuing therefrom will commingle with each other and thoroughly break up the stream of fuel laden air emerging from the end of said passage, means for introducing air into the agitating chamber, and means for supplying air from a common source under pressure for the three purposes.

5.,In a device of the class described, the combination with a chamber for agitating and mixing fuel and 'air, of a pipe receiving the mixture from said chamber, an injector delivering air to one end of said pipe, a noz zle cylinder receiving the other end of said air at'the other end of said passage, said in ector consisting of two pipesthe fuel-laden current coming through the pip diametrically the two streams of air issuing therefrom will said injector consisting of two pipesoppo'sed to each other so that 55 will be to break up the stream of fuel enter- .mgthe hopper, a passage recelvmg the comnnngled air and fuel from the chamber "I-commingle and thoroughly break up the stream offuel laden air emergi 1. from the pipe,and suitablepipe means fc; de ivering.

combination of a conical, agita ng and mixof a conical-shaped hopper, means for. introducing air under pressure into said hopper, said means consisting of two pipes entering the sides of the hopper at opposite points, but fixed indirection so that the two streams of ai rjcleliuered thereby will passin parallel ing chamber, means for feeding fine fueL lifes without directly impinging npon'each thereto, a pipe receiving-the.c mmingled air f andafuel from said chamber, -1ir inlet means I i a blastoffair intoone end of the said p pe forfissage recelving the commingled alr and for said chamber, means for introducing a transpoi'ting the fuel to the end of the latter, a. nozzle cylinder surrounding said lat- -,ter end and receiving the fuel-laden air dis- .underpressure-into said cylinder for use as charged thereinto, means for introducing air combustion air with the fuel'laden current, said means consisting of a palr of pipes situated d ametrically opposite to each other so the stream of'fuel laden 3 tially as described.

7. In a device of the class describechthe combination with a. mixing chamber, conthat the two streams of air issuing therefrom will commingle and thoroughly break up air, all substan sisting of a.conical-shaped hopper, means for introducing air under pressure. into said irection so .thatthe two streams of air from hopper, said means consisting of two pipes inserted in the sides of said hopper diametrically opposite to each other, but fixed indithe two gpipes will not commingle by a d-ir'ect' impingement upon each other, but will 1 pass each other in parallel lines so as to thoroughly breakiup the stream of fuel laden fair entering the hopper, a passage leading from said mixingchamber, means for. causingan alr blast to enter one end of said passage to provide fuel-carrying air, means for supplying airJunder pressure at the 'discharge end of said pipe, and means for supplying airfor the three purposes from a common source. 1

8. 1 In a device of the class described, the combination with a mixing chamber for commingling air and fuel, said chamber consisting ofa conical-shaped hopper, means fol-introducing air under pressure into said hopper, said means consisting of two pipes entering the sides of the hopper opposite to each other, butfixed in direction so that the two streams of air issuing therefrom 'will' not directly impinge upon each other but .willpass along parallel lines ashort distance apart so that the effect of the air blast wherein it is mixed, an injector for introducing air into-one end of said passage. and another lIllQCtOl' for supplying air to the fuelother, and will have the effect of blowing or deviating hopper so as to thoroughly break it up, a

fuel from the chamber wherein they are mixed, an injector for introducing air intoone end of the said passage, another injector for supplying air to the fuel-laden air as it the stream of fuel entering the emerges from said passage, and means'for supplying air under pressure, to both 1n-- je'ctors froma common source.

10. In a mechanism for feeding andburning fine fuel, the combination of an agitat ing chamber wherein the powdered fuel, is stirred and mixed with air, said chamber consisting of a conicalshaped hopper, means for introducing air under pressure into said chamber, said means conslsting of two pipes entering the sides of said hopper at opposite points, but fixed in direction so that the two streams of air therefrom .will pass along parallel lines a short distance from. each other without directly-impinging on each other so that the stream offuel entering the hopper may be thoroughly broken up, a

passage conveying air and fuel from said let devices entering the sides of said hopper at points substantially opposite, but fixed in direction so that the two streams ofair delivered therefrom-shall pass along parallel lines without directly impinging on each other so that thestream of fuel entering said chamber consist-.

11' hopper, said means consisting of a pair of in- I the hopper may be thoroughly broken up, a pipe or passage receiving the mixture fronr said agitating chamber, an injector delivering air to'one end of said pipe, a nozzle cylinder receiving the other end of said pipe. an injector delivering' air into said nozzle cylinder for use as combustion air with-the fuel-laden current coming through the pipe.

v 12. Ina device of the class described, the I combination aconical agitating and mixing chamber. means for feeding fine fuel ,,thereto, means for mtrorilucu g air under v 4: r v 1,185,156

pressure into said mixing chamber, said means consisting of two inlet pipes entering the sides of said hopper at substantially oppositepoints. but fixed in direction so that the two streams'of air delivered thereby may pass along separate lines at a short dis tance from each other without directly commingling so that they will have theefi'ect of breaking up the stream of fine fuel entering the hopper, a pipe receiving the commingled air'and fuel-from said agitating and mixing chamber, means for introducing a blast of air into one end of the said pipe for transporting the fuel to the end of the latter, a

nozzle cylinder surrounding said latter end and receiving the fuel laden air discharged thereinto, means for introducing air under pressure into said cylinder for use as combustion air with the fuel laden current, all substantially as described.

13. In a device of the class described, the

combination with a mixing chamber, consisting of a conicalshaped hopper, means for introducing air into said mixing chamber, consisting of two pipes entering the sides of said hopper at substantially opposite points so that the two streams of air delivered therefrom will pass along parallel lines closely contiguous to'each other so as to produce .a breaking up effect on the stream of entering fuel, a passage leading from the said mixing chamber and receiving commingled air and fuel therefrom,

7 means for causing an air blast to enter one end of said passage to provide fuel carrying air, means for supplying air under pressure at the discharge end of said passage, said means comprising two pipes diametrically opposed to each other so that the two streams of air issuing therefrom will commingle and thoroughly break up the stream of fuel ladenv air, and means for supplying air for the three purposes from a common source. I

In testimony whereof I affix my signature in the presence of two witnesses.

' WALTER D. WVOOD.

WVitnesses:

ELMER J. AUs'r N, E. M. BRYMAN. 

